Abstract: Described herein is a process for producing insulated pipes including providing a media pipe and a film hose continuously formed from a film or a media pipe and a jacketing pipe, wherein the media pipe is arranged inside the film hose or the jacketing pipe and a slot is formed between the media pipe and the film hose or jacketing pipe, wherein an adhesion promoter is applied to the surface of the media pipe facing the film hose or the jacketing pipe, introducing a polyurethane system at least including an isocyanate component (a) including at least one isocyanate, a polyol component (b), and at least one catalyst into the slot before the adhesion promoter is fully cured, and foaming and curing the polyurethane system. Also described herein are insulated pipes obtainable or obtained by such a process.

Abstract: A method for production of a tubular body applying the following steps: Pressureless application of at least one first curable plastic layer made of reactive polyurethane materials with a core via a rotational molding process, Curing the at least one plastic layer, Winding at least one reinforcement layer onto the at least one first plastic layer, Pressureless application of at least one second curable plastic layer, wherein the reinforcement layer is embedded without holes between the two plastic layers, and Removal of the core after completion of the body. Because of this, the position of the reinforcement layer 7 can be individually established and it can be ensured that the reinforcement layer will not penetrate into the first plastic layer during winding after the curing of the first plastic layer.

Abstract: The present invention discloses a single layer rotomolded article prepared from a blend of polyethylene, functionalized polyolefin and one or more resins selected from polyetherester or saturated polyester or polycarbonate or polyamide.

Abstract: Provided is a construction machine that enables to reduce the burden of the operator when the operator replenishes a liquid reducing agent. The construction machine includes an upper frame slewably provided on a lower traveling body, a reducing agent tank provided on the upper frame, and configured to accommodate therein a liquid reducing agent for reducing nitrogen oxide contained in exhaust gas, and a passage surface provided on the upper frame for allowing the operator to move to an engine. The reducing agent tank has an upper placement portion disposed on the right side of the passage surface at a position higher than the passage surface. The upper placement portion of the reducing agent tank has a replenishing port for allowing the operator to replenish the liquid reducing agent. The replenishing port is provided so as to face the passage surface.

Abstract: The present invention relates to a method for enhancement of the minimal shear molding process utilizing pellets and/or micropellets produced through controlled extrusional and pelletization processes in combination with nonpowder melt flow rheology that incorporates reduced molding temperature and/or reduced cure time, reduced rotation axis ratios and/or reduced rotation rates. Molding can be uniaxial, biaxial, or multiaxial rotational or oscillatory or both. The molded items produced can be single or multiple layers and can be produced in one or more molding sequences using similar or different chemical compositions.

Abstract: A method for manufacturing an interior lining part, includes producing a skin; placing the skin in a foaming mold with a support layer; foaming an intermediate layer; cutting out an area of the skin producing a cutout area of the skin; placing a piece of adhesive tape or film in the cutout area, the piece of adhesive tape or film being placed in between the skin and the intermediate foam layer; and placing an insert in the cut out area of the skin. A method for manufacturing an interior lining part, includes producing a skin by rotational molding; placing a piece of adhesive tape or film in the cutout area, the piece of adhesive tape or film being placed in between the skin and the intermediate foam layer; placing the skin in a foaming mold with a support layer; foaming an intermediate layer; cutting out an area of the skin producing a cutout area of the skin; and placing an insert in the cut out area of the skin.

Abstract: A method to manufacture cushion composite structure utilizes a mold including a first mold body and a second mold body wherein at least one thereof forms a mold room. The method includes the following steps: injecting foam material into the mold room, placing a compressible core into the mold room, closing the mold, rotating the mold and foaming the foam material to fill up the mold room, and removing the mold to form the cushion composite structure. Thereby, the core is embedded in the foam material at a predetermined position, and parting line on surface of the cushion composite structure is prevented.

Abstract: This invention discloses three-layer rotomoulded motorboats having excellent floatability prepared from foamed polyethylene.

Abstract: This invention discloses three-layer rotomoulded motorboats having excellent floatability prepared from foamed polyethylene.

Abstract: The nature of the rotational molding process is cyclic. It requires the temperature of the rotating mold and the plastic it is charged with to be elevated from room temperature to beyond its melting temperature and then cooled back to room temperature. Consequently, rotational molding cycle times are lengthy, which is often considered as the fundamental drawback of this plastic fabrication process. The motivation and objectives of this disclosure are twofold. The presently proposed invention focuses on developing an innovative extrusion-assisted rotational foam molding processing technology for the manufacture of integral-skin cellular composite moldings having adjacent, but clearly distinct, layers of non-cellular and cellular structures, consisting of identical or compatible polymeric grades.

Abstract: Systems and cold rotational molding methods are provided for making hollow, foam-backed polymeric molded articles. The molded articles can be manikins or manikin parts, or other articles, such as frames (e.g. for mirrors and pictures), urns, fixtures, furniture, display props, and garden furniture, made of a thermosetting elastomeric material. The articles are more structurally rigid than previous molded articles utilizing the same amount of polymer material, lighter in weight than previous molded articles having the same structural rigidity, and more resistant to deformation under temperatures up to 180 to 185° F. The process of making a molded manikin part, from the first injection of polymer into the mold until demolding of the finished part, can be completed in as short a time as 18 minutes without the necessity for cradling of the demolded part, even when the part requires one or more flat surfaces.

Abstract: A method for forming a tail fin of wind turbine includes first pouring a proper amount of molten plastic into a mold having a cavity showing a contour of the tail fin and the mold is rotated to induce a centrifugal force that makes the plastic uniformly sticking to an inside surface of the cavity to form a tail fin that shows an aerodynamic feature of a one-piece hollow shell. The tail fin, when mounted to the wind turbine, realizes efficient and stable control of rotor blades at a front end of the nacelle in alignment with windward direction so as to improve the use of wind power and make the tail fin and the rotor blades in a weight balanced condition to thereby reduce the load applied to a yaw bearing located under the nacelle and extend the service life of the bearing.

Abstract: A method for operating a rotary press, comprising a rotor rotatably driven about a vertical axis that has a die-plate and upper and lower rams which, while being guided vertically in guides of the rotor, interact with holes of dies in the die-plate wherein at least one compression station is provided and has an upper and a lower pressing roller past which the presser rams run along and by which they are moved towards the die-bore for the purpose of compacting the material in the die-hole, wherein the upper and lower rams are lifted subsequent to the compression procedure, causing the lower ram to eject a compact from the die and the compact to be stripped by a stripper in the direction of a discharge chute, characterized in that while an compact ejection procedure is under way the upper ram stands upright on top of the compact and is lifted therewith and the stripper seizes the compact laterally while the upper ram is still standing upright on top of the compact.

Abstract: Plastic foam has excellent heat insulation properties, however, moisture absorption is causing a decrease in the heat insulation, and plastic foam has almost no mechanical strength. Therefore, a heat insulation material that absorbs almost no moisture and has satisfactory strength is desired to appear. According to the present invention, a foam composite with a skin can be formed in one shot by charging plastic powders or minute particles together with polyolefin pellets that can be cross-linked and foamed in a mold, and heating the mold while rotating. The composite absorbs almost no moisture, having satisfactory strength, being excellent as an insulating material. Further, providing a covering of a non-foaming or a slightly foaming material to the pellet of polyolefin that can be cross-linked and foamed, and conducting the forming, foamed granules of preferably 5 to 50 mm largeness as a core, and a covering of a reinforcing member with 0.05 to 0.

Abstract: A valve in a mold as to provide a potential airflow pathway either way, the valving having at least a substantially closed condition from which it can be opened by a pressure differential in one direction that is below that which will cause it to open or fail to allow an airflow in the other direction.

Abstract: The invention relates to a method and a device for the production of plastic molded skins, which are formed by consecutively performing a plurality of partial melting processes of a plurality of plastic materials, wherein the first plastic material is applied to the mold as a plastic powder in a centrifugal molding method and the second plastic material by a spraying method.

Abstract: The nature of the rotational molding process is cyclic. It requires the temperature of the rotating mold and the plastic it is charged with to be elevated from room temperature to beyond its melting temperature and then cooled back to room temperature. Consequently, rotational molding cycle times are lengthy, which is often considered as the fundamental drawback of this plastic fabrication process. The motivation and objectives of this disclosure are twofold. The presently proposed invention focuses on developing an innovative extrusion-assisted rotational foam molding processing technology for the manufacture of integral-skin cellular composite moldings having adjacent, but clearly distinct, layers of non-cellular and cellular structures, consisting of identical or compatible polymeric grades.

Abstract: This invention relates to the field of multilayer articles having reinforced structural properties prepared by rotational moulding wherein the external and internal skin layers are prepared from polyethylene resin and the intermediate layer is prepared from foamed polyethylene.

Abstract: A simulated stone or brick column is fabricated by a method that involves providing a hollow closed mold that has an inner face in the form of a reverse image of the desired stone or brick surface. A liquid casting material is introduced into the mold and in the mold is rotated about two perpendicular axes so that the casting material coats the inner face of the mold and results in the formation of a hollow column having the external appearance of the desired stone or brick surface. The casting material forms a molded column that has a texture and contour that simulate a stone or brick surface. A mailbox and newspaper tube can be installed in the column.

Abstract: Systems and cold rotational molding methods are provided for making hollow, foam-backed polymeric molded articles. The molded articles can be manikins or manikin parts, or other articles, such as frames (e.g. for mirrors and pictures), urns, fixtures, furniture, display props, and garden furniture, made of a thermosetting elastomeric material. The articles are more structurally rigid than previous molded articles utilizing the same amount of polymer material, lighter in weight than previous molded articles having the same structural rigidity, and more resistant to deformation under temperatures up to 180 to 185° F. The process of making a molded manikin part, from the first injection of polymer into the mold until demolding of the finished part, can be completed in as short a time as 18 minutes without the necessity for cradling of the demolded part, even when the part requires one or more flat surfaces.

Abstract: A multi-density polymeric interbody spacer formed from biocompatible material for osteoconductivity includes multiple density regions of different porosity to provide both strength and osteoconductivity. An interface region is formed between the density regions to provide both direct adhesion and mechanical interlocking between the different density regions to increase the strength of the multi-density polymeric interbody spacer. A method for forming the multi-density polymeric interbody spacer includes curing a first density region to achieve a first target porosity. A second density region may then be molded to the first density region to achieve a second target porosity. A portion of the second density region partially flows into pores of the first density region, providing direct adhesion and mechanical interlocking between the first and second density regions.

Abstract: The present invention relates to new fibers, new processes of using said fibers, and new sheath dope compositions for multi-layer spinning processes. The fibers comprise a porous core and a sheath surrounding said porous core. The fibers may be useful in, for example, processes for removing low level contaminants like sulfur compounds from a gas stream like natural gas.

Abstract: The invention relates to a polymeric material having an anisotropic shape and comprising multiple cavities, wherein said cavities comprise a functional liquid. The invention also relates to a process of making the polymeric material from an emulsion of a functional liquid with a polymer in solution, in the melt or a polymer precursor which reacts to obtain the polymeric material having cavities filled with functional liquid.

Abstract: A foam layer is formed by rotomoulding including heating a foaming polymer, and wherein the heating is interrupted before the foaming temperature is reached. A thermal inertia of the system also composed of the mold and previously placed layers assures completion of heating, but not sufficient to cause disorderly foaming. The foam layer is uniform and bonding. Dense layers surrounding the foam layer may be different.

Abstract: The invention relates to a method for the production of plastic molded skins which are built up by consecutively melting multiple plastics onto each other. The surface of the forming tool is partially covered with a covering or mask during the melting of a first plastic powder and the first plastic powder is applied to the forming tool by a powder spray method. Thereafter, the covering or mask is removed from the surface of the forming tool and the second plastic powder is applied to the surface of the forming tool and to the first plastic powder by rotation sintering.

Abstract: The nature of the rotational molding process is cyclic. It requires the temperature of the rotating mold and the plastic it is charged with to be elevated from room temperature to beyond its melting temperature and then cooled back to room temperature. Consequently, rotational molding cycle times are lengthy, which is often considered as the fundamental drawback of this plastic fabrication process. The motivation and objectives of this disclosure are twofold. The presently proposed invention focuses on developing an innovative extrusion-assisted rotational foam molding processing technology for the manufacture of integral-skin cellular composite moldings having adjacent, but clearly distinct, layers of non-cellular and cellular structures, consisting of identical or compatible polymeric grades.

Abstract: The present invention discloses the use in rotomolding or slush molding applications of a composition comprising a polyolefin, a processing aid and optionally a UV-stabilizer.

Abstract: A method for forming a surfboard is provided. The method comprises adding a polyethylene mixture into a mold having one or more ventilation holes located therein. The polyethylene mixture comprises a blend of a polyethylene material and a foaming agent. The polyethylene material is in a form comprising at least one of a powder form, a pellet form and mixtures thereof. In addition, the method comprises heating the polyethylene mixture in the mold while rotating the mold for a pre-determined period of time and at a predetermined temperature. Further, the method also comprises cooling the mold for a predetermined amount of time, and wherein either a main body of a surfboard or an entire surfboard is then formed.

Abstract: The process for manufacturing a multi-element sponge consists of mixing together a polymer and a reagent to form a mixture to be expanded to produce a spongy mass, casting the mixture in a mould, depositing an insert onto said mixture and allowing the mixture to expand while maintaining the insert pressed against it, so that on termination of expansion the insert is directly connected to the spongy mass.

Abstract: Method for the production of a biocompatible polymer-ceramic composite material with a predetermined porosity, designed and determined a priori, which includes a first phase (a) of the production of a suspension of a bioceramic material in distilled water, a second phase (b) in the which a compact of the bioceramic material containing a desired quantity of water is obtained from the suspension, and a third phase (c) in the which the compact is mixed with a polymeric material and/or a liquid monomer.

Abstract: A method is provided for producing a hollow body by rotational moulding, followed by filling the hollow body with expanded polyurethane.

Abstract: A plastic table structure includes a tabletop comprising a thin polymer shell layer surrounding an expanded foam core. The multiple layers of the finished tabletop are molded concurrently in a one-pass biaxial or centrifugal rotational molding process, and cured in an oven. The method includes the steps of introducing polymeric material into a mold, and rotating the mold while heating it to a first temperature so as to form a molten shell of a portion of the polymeric material on the inside of the mold. A foaming agent is introduced within the mold and mixes with a second unmelted portion of the polymeric material and distributes throughout the mold. When the mold reaches a second higher decomposition temperature, the foaming agent causes expansion of the second portion of the polymeric material, forming an expanded foam core inside the shell.

Abstract: A wheel is provided for coupling to a bearing case at an outer cylindrical surface and a lateral annular surface of the bearing case. The wheel includes an inner wheel portion with an annular body defining a central hole with an inner cylindrical surface and a lateral annular surface for engaging the bearing case. The inner wheel portion may substantially comprise a thermoset, polyurethane material having a density and have a surface exhibiting a hardness. The wheel also may include an outer wheel portion bonded to the inner wheel portion. The outer wheel portion may be substantially comprised of the same thermoset, polyurethane material as the inner wheel portion. The outer wheel surface may exhibit a hardness substantially the same as that of the inner wheel surface. The inner wheel material may have a lesser density than that of the outer wheel material.

Abstract: A process for manufacturing a capital for an architectural column. The inside of a mold for an architectural column is lightly coated with a mold release. A first opening of the mold is placed upon a surface, and a plug is positioned on the surface within the first opening. Through another opening foam is poured around the plug. After the foam has hardened, the mold is removed from the surface. All other openings in the mold are securely covered. Then an elastomer is introduced into the mold, and the mold is rotated about multiple different axes. The introduction of the elastomer is repeated after the prior coating created by the introduced elastomer has become tacky but before the prior coating has become firm. After the final coating of elastomer has become tacky but not firm, foam is introduced into the mold.

Abstract: A method of manufacturing a double-walled vessel comprises: a) providing an inner hollow body (5); b) mounting the inner hollow body (5) in a rotational mould (1) with the external surface of the inner body spaced from the internal surface of the mould; and c) rotationally moulding a hollow plastics outer body around, and spaced from the inner body in such a manner as to join the inner and outer bodies together at at least one predetermined location.

Abstract: The present invention pertains to a process for the rotational molding of polyurethane composite articles. The process is carried out by placing a polyurethane composite precursor composed of a hardener, a resin and a filler, wherein the hardener comprises one or more organic di- or polyisocyanates, and the resin comprises of one or more compounds containing at least two isocyanate-reactive groups, the filler is about 15% to about 50% by weight, or alternatively, about 15% to about 35% by weight, or, in a preferred embodiment, about 25% by weight, the % weight being based upon total weight of the mixture, and either the hardener or the filler optionally contains additives and/or catalysts in a rotational mold, and rotating said mold until at least the first cure time of the molded article is completed. The invention a also pertains to the articles produced by use of this method.

Abstract: A process for manufacturing a capital for an architectural column. The inside of a mold for an architectural column is lightly coated with a mold release. A first opening of the mold is placed upon a surface, and a plug is positioned on the surface within the first opening. Through another opening foam is poured around the plug. After the foam has hardened, the mold is removed from the surface. All other openings in the mold are securely covered. Then an elastomer is introduced into the mold, and the mold is rotated about three different axes. The introduction of the elastomer is repeated after the prior coating created by the introduced elastomer has become tacky but before the prior coating has become firm. After the final coating of elastomer has become tacky but not firm, foam is introduced into the mold.

Abstract: New cross-linked polymeric foam compositions, and methods for making the same, are provided. The new compositions utilize novel cross-linked polyolefin copolymers and show improvements in strength, toughness, flexibility, heat resistance and heat-sealing temperature ranges as compared to conventional low density polyethylene compositions. The new compositions also show processing improvements over linear low density polyethylene. The novel polyolefins, which are essentially linear, comprise ethylene polymerized with at least one alpha-unsaturated C3 to C20 olefinic comonomer, and optionally at least one C3 to C20 polyene, and exhibit, in an uncross-linked sense, a resin density in the range of about 0.86 g/cm3 to about 0.96 g/cm3, a melt index in the range of about 0.5 dg/min to about 100 dg/min, a molecular weight distribution in the range of from about 1.5 to about 3.5, and a composition distribution breadth index greater than about 45 percent.

Abstract: A process for manufacturing a capital for an architectural column. The inside of a mold for an architectural column is lightly coated with a mold release. A first opening of the mold is placed upon a surface, and a plug is positioned on the surface within the first opening. Through another opening foam is poured around the plug. After the foam has hardened, the mold is removed from the surface. All other openings in the mold are securely covered. Then an elastomer is introduced into the mold, and the mold is rotated about multiple different axes. The introduction of the elastomer is repeated after the prior coating created by the introduced elastomer has become tacky but before the prior coating has become firm. After the final coating of elastomer has become tacky but not firm, foam is introduced into the mold.

Abstract: A process for manufacturing a capital for an architectural column. The inside of a mold for an architectural column is lightly coated with a mold release. A first opening of the mold is placed upon a surface, and a plug is positioned on the surface within the first opening. Through another opening foam is poured around the plug. After the foam has hardened, the mold is removed from the surface. All other openings in the mold are securely covered. Then an elastomer is introduced into the mold, and the mold is rotated about three different axes. The introduction of the elastomer is repeated after the prior coating created by the introduced elastomer has become tacky but before the prior coating has become firm. After the final coating of elastomer has become tacky but not firm, foam is introduced into the mold.

Abstract: Disclosed is a sheathing material for a construction machine and a method for producing the same, in which lightweighting can be attained without using a reinforcing member, and which is not greatly flexed even if a load is applied. The sheathing material for a construction machine which is lightweighted and has a flexure rigidity is obtained by molding a resined shell 1d having a hollow construction by rotational molding, filling a resin foamed body 1e such as a hard polyurethane foam within the resined shell 1d to set it, thereby providing a sandwiching construction, and adjusting filling density of the resin foamed body 1e.

Abstract: A high impact resistant rotationally molded door and process for molding the door has the hinge post integrally attached to the rotationally molded skin of the door. A hinge member is provided that has a perforate U-shaped metal sheet bonded to preferably the upper portion of the hinge post. The sides of the U-shaped metal sheet are spaced sufficiently apart so that registration with the subsequently rotationally molded plastic skin of the door occurs. This hinge member at the perforate metal sheet rapidly heats during rotational molding. The perforate metal thus bonds to integrally mold with the skin of the door. This bonding occurs as the hinge post is molded within the hollow door construction along its hinging edge. The hinge member attaches at the perforate U-shaped metal sheet to the skin of the door while all other portions of the hinge post are free to move with respect to the door. The door is thus formed without door warping during curing and shrinking of rotationally molded plastic door body.

Abstract: A high impact resistant rotationally molded door and process for molding the door has the hinge post integrally attached to the rotationally molded skin of the door. A hinge member is provided that has a perforate U-shaped metal sheet bonded to preferably the upper portion of the hinge post. The sides of the U-shaped metal sheet are spaced sufficiently apart so that registration with the subsequently rotationally molded plastic skin of the door occurs. This hinge member at the perforate metal sheet rapidly heats during rotational molding. The perforate metal thus bonds to integrally mold with the skin of the door. This bonding occurs as the hinge post is molded within the hollow door construction along its hinging edge. The hinge member attaches at the perforate U-shaped metal sheet to the skin of the door while all other portions of the hinge post are free to move with respect to the door. The door is thus formed without door warping during curing and shrinking of rotationally molded plastic door body.

Abstract: New cross-linked polymeric foam compositions, and methods for making the same, are provided. The new compositions utilize novel cross-linked polyolefin copolymers and show improvements in strength, toughness, flexibility, heat resistance and heat-sealing temperature ranges as compared to conventional low density polyethylene compositions. The new compositions also show processing improvements over linear low density polyethylene. The novel polyolefins, which are essentially linear, comprise ethylene polymerized with at least one alpha-unsaturated C3 to C20 olefinic comonomer, and optionally at least one C3 to C20 polyene, and exhibit, in an uncross-linked sense, a resin density in the range of about 0.86 g/cm3 to about 0.96 g/cm3, a melt index in the range of about 0.5 dg/min to about 100 dg/min, a molecular weight distribution in the range of from about 1.5 to about 3.5, and a composition distribution breadth index greater than about 45 percent.

Abstract: In a preferred embodiment, the invention is a non-deflatable tire assembly having a hollow toroid-shaped flanged insert, a flexible body molded around the insert to form a tire, and at least one rim onto which is mounted the tire. The flange of the insert extends toward the central axis of the insert, and is used to attach the tire to the rim(s) via bolts through matching holes within the flange and rim(s). The flexible body may be made of a foam polyurethane matrix formed of a combination of polyol and polyisocyanate, while the flanged insert may be made of a high density polyethylene. A tough, flexible, and abrasive-resistant layer of polyurethane elastomer is preferably formed around the flexible body to define sidewalls and treads of the tire.

Abstract: A method of producing a plastics article having solid skin and a foam core by a rotational moulding process, comprises charging a mold with a skin-forming component and substantially simultaneously with a foam core-forming component of bulk density greater than 0.5 g/cc, providing a first heating stage in which the mold is heated to a first temperature and is rotated for a first predetermined time to form a substantially impervious skin within the mold, and providing a second heating stage in which the mold is heated to a higher second temperature and is rotated for a second predetermined time to cause foaming of said foam core-forming component, thereby forming a foam core within said substantially impervious skin.

Abstract: A process for producing pipes illustrated with foams comprises [a] providing, between an inner carrier pipe and an outer pipe arranged parallel thereto, a holder which is provided with at least one aperture and is mounted so that it can be moved axially and positions the carrier pipe in the outer pipe and [b] introducing into the vacant space between the two pipes, via the aperture (s) in the holder, a mixture for the preparation of foams, where [b1)] during the introduction of the mixture, the holder moves in an axial direction with respect to the outer pipe and the carrier pipe, then [c] after the mixture is charged, it is reacted to give the foam and [d)] the holder and, if desired, the outer pipe are removed.

Abstract: A method for rotational molding of articles, including the step of rotationally molding a mixture of particulate plastics material comprising at least one thermoplastics material having a first particle size and a second thermoplastics material having a larger particle size wherein, in use, said first thermoplastic material fuses to form an outer skin and subsequently said second thermoplastics material fuses to form an inner skin bonded to the outer skin of a resultant molded article. The method may also include the step of incorporating a quantity of rollable molded reinforcing elements in the mold with said first and second thermoplastics materials, wherein the reinforcing elements are located in a spaced array thereby forming bridges between opposed inner skin surfaces as they expand. Articles, such as a shipping pallet, rotationally molded using the method are also disclosed.